You are not talking about "water chestnut" Oh, there is no "water notes" this thing. The water chestnut looks a bit like a persimmon.

Water chestnut is also known as "south chestnut", "horseshoe", "ground corn", etc., for the perennial shallow water herbs. Underground stolon, the apex expanded for the bulb, the bulb is flat globular, smooth surface, ripe dark chestnut shell color or date red, there are 3-5 rings of links, and a short beak-like terminal buds and side buds. Native to India and the south of China, now China is mainly distributed in Jiangsu, Anhui, Zhejiang, Guangxi, Guangdong, Fujian and other water areas. It is marketed in winter and spring every year. See picture: